Explications étape par étape:
aigle:
1,2km = 1 200m
1,2km/30s = 1 200m/30s
1 200÷30 = 40m/s
1h = 3 600secondes
40m/s = 40m× 3 600 / h = 144 000m/h = 144km/h
voiture:
65km/h = 65÷60km/mn
pour 12mn on a (65÷60)×12 = 13km
En 1h12mm la voitute a roulé 65 + 13 = 78km
avion:
3 400 ÷ 800 = 4,25h
0,25h = 60mn × 0,25 = 15mn
l´avion mettra 4h15mn.
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Verified answer
Explications étape par étape:
aigle:
1,2km = 1 200m
1,2km/30s = 1 200m/30s
1 200÷30 = 40m/s
1h = 3 600secondes
40m/s = 40m× 3 600 / h = 144 000m/h = 144km/h
voiture:
65km/h = 65÷60km/mn
pour 12mn on a (65÷60)×12 = 13km
En 1h12mm la voitute a roulé 65 + 13 = 78km
avion:
3 400 ÷ 800 = 4,25h
0,25h = 60mn × 0,25 = 15mn
l´avion mettra 4h15mn.